linux-kernel - Re: [PATCH 1/3] Input: export LEDs as class devices in sysfs

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Date:	Wed, 10 Jun 2015 08:34:43 +0200
From:	Pavel Machek <pavel@....cz>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Samuel Thibault <samuel.thibault@...-lyon.org>,
	Pali Rohár <pali.rohar@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	rpurdie@...ys.net, Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 1/3] Input: export LEDs as class devices in sysfs

On Tue 2015-06-09 09:49:35, Dmitry Torokhov wrote:
> On Tue, Jun 09, 2015 at 03:19:55PM +0200, Samuel Thibault wrote:
> > Hello,
> > 
> > Dmitry Torokhov, le Mon 08 Jun 2015 14:43:08 -0700, a écrit :
> > > 1. Instead of making LED class devices part of the input device they are
> > > implemented as an input handler (and thus are completely separate from
> > > input core).
> > 
> > That's nicer indeed.  Not defining triggers per LED however does not
> > permit to e.g. switch two leds of a keyboard independently of what
> > produces input events.  I'm personally fine with it, I just wanted to
> > mention it since this example of usage was cited at some point in the
> > thread.
> 
> I might have over-though the issue a bit in the past ;) But I think I am
> happy with the current behavior, it separates input events and leds and
> just says that you can select what tgrigges led state change. And you
> shoudl still be able to do:
> 
> echo "kbd-ctrlllock" > /sys/..../input22::caps-lock/trigger
> echo "heartbit" > /sys/..../input22::num-lock/trigger
> echo "kbd-numlock" > /sys/..../input22::scroll-lock/trigger
> 
> But you can't say that pressing CapsLock on keyboard1 should light up
> ScrollLock led on keyboard2, nor do we want it I think. If such control
> is truly needed userspace can take over and managed leds as it sees fit,
> like X does.

Ack. Please keep it simple.
									Pavel
									
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